It is the development of blood clot in deep veins of the body. During pregnancy 80% of the cases occur in left leg. The condition is life threatening if untreated as the clot can break off and travel to blood vessels of the lungs and can cause death. Having a DVT is not common in pregnancy, but pregnant women are more likely to develop thrombosis than non-pregnant women of the same age. A clot can appear during any phase of pregnancy and up to six weeks after the birth. It is more common if you have previous family history, high blood pressure, smoking, taking birth control pills, dehydration, thrombophilia, severe varicose veins and age of above 35 years. The patient presents with pain and heavy feeling in the leg, swelling, redness, and tenderness in lower leg, warm skin, rapid heart rate and breathing rate. 

Pulmonary embolism (PE) can be developed when a blood clot travels to the lungs and that can be fatal posing symptoms like sudden difficulty breathing, chest pain/tightness, or collapse.  The chance of developing PE is very low if once the DVT is diagnosed and treatment is started. Low Molecular Weight Haprin (LMWH) is an anticoagulant, which prevents the blood clot to get bigger, and is usually used to treat pregnant women with DVT. LMWH is very effective as it does not adversely affect the baby, and it gets dissolved in body easily. LMWH alsp prevents the woman body from developing PE and getting other blood clots. Self-help of DVT can be staying as active as possible and wearing a prescribed compression stocking to help circulation in leg.  It can be prevented by simple exercise (moving leg and walking on and off) during pregnancy, drinking plenty of water, and avoid alcohol and smoking.